Bug 1774972 (CVE-2019-19043)

Summary:	CVE-2019-19043 kernel: dos in i40e_setup_macvlans() function in drivers/net/ethernet/intel/i40e/i40e_main.c
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, qzhao, rt-maint, rvrbovsk, steved, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel. The i40e_setup_macvlans function mishandles resource cleanup. A local attacker, able to induce the error conditions, could use this flaw to crash the system. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-30 13:04:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1774973
Bug Blocks:	1775019

Description Dhananjay Arunesh 2019-11-21 10:56:34 UTC

A memory leak in the i40e_setup_macvlans() function in drivers/net/ethernet/intel/i40e/i40e_main.c in the Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering i40e_setup_channel() failures

Reference:
https://github.com/torvalds/linux/commit/27d461333459d282ffa4a2bdb6b215a59d493a8f

Comment 1 Dhananjay Arunesh 2019-11-21 10:57:23 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1774973]

Comment 4 Petr Matousek 2020-04-30 12:58:19 UTC

Statement:

This issue is rated as having Moderate impact because of the preconditions needed to trigger the error code path.

Comment 5 Petr Matousek 2020-04-30 12:58:24 UTC

Mitigation:

In order to mitigate this issue it is possible to prevent the affected code from being loaded by blacklisting the kernel module i40e. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 .